PYSEC-2026-4149 PyJWT: Public keys in DER form are accepted as HMAC secrets, bypassing the CVE-2022-29217 guard

Summary HMACAlgorithm.preparekey blocks asymmetric keys from being used as HMAC secrets by searching for text markers only. It looks for -----BEGIN and for an ssh- prefix. The same key in DER form is binary ASN.1 and has neither marker, so it passes the check and is used as an HMAC secret. An...

PYSEC-2026-4147 PyJWT: Non-canonical signature segments enable raw-token revocation bypass

Summary PyJWT 2.13.0 accepts compact JWS signature segments containing characters that are not in the Base64URL alphabet. Appending !!!! to a valid signature does not change the decoded signature bytes or authenticated claims, but it changes the serialized token and its SHA-256 hash. An applicati...

PYSEC-2026-4175 urllib3: HTTPS proxy TLS configuration may be ignored or overridden

Impact urllib3 supports configuring TLS independently for an HTTPS proxy and the target server. proxysslcontext, proxyasserthostname, and proxyassertfingerprint configure the TLS connection to the proxy. sslcontext and the other target-specific TLS parameters configure the connection to the targe...

PYSEC-2026-4142 PyJWT: Uncaught RecursionError in jwt.decode() on deeply nested token header

Package pyjwt PyPI Affected versions tested & verified on: 2.13.0. Every version whose PyJWS.load translates only ValueError is affected Description PyJWS.looad jwt/apijws.py:337 splits the compact token, base64url decodes the header segment and hands it to json.loads before verifysignature runs...

PYSEC-2026-4144 PyJWT: PyJWKClient follows redirects when fetching JWKS

Summary PyJWT 2.13.0 PyJWKClient followed HTTP redirects while fetching a JWKS, without validating the redirect destination. A configured trusted endpoint could therefore redirect the client to a different host. Impact When an application uses PyJWKClient with caller-supplied request headers and ...

PYSEC-2026-4145 PyJWT: Asymmetric-PEM detection bypass: whitespace/line-ending-mutated public keys skip the HS/asymmetric confusion guard

Prerequisites both conditions must hold; both are deployment properties, not attacker-controlled at request time: - The jwt.decode allow-list mixes an HMAC algorithm with an asymmetric one, e.g. algorithms="ES256", "HS256" the RFC 8725 footgun the guard exists to backstop. - The verification key ...

PYSEC-2026-4148 PyJWT: ReDoS vulnerability when calling the `is_pem_format` function.

Summary There is a Re-DoS vulnerability in the ispemformat function which results in a intesive CPU usage if an attacker is been able to provide a custom certificate. Details The problem is that the lazy quantifier .+? will always first try to match as little as possible until it finds a ---- END...

PYSEC-2026-4150 PyJWT BOM Bypass

Affected Package - Package: PyJWT pyjwt on PyPI - Repository: https://www.google.com/url?q=https://github.com/jpadilla/pyjwt&source=gmail&ust=1781794518474000&sa=E - Affected version: 2.13.0 - Vulnerability class: Algorithm confusion / patch bypass --- Root Cause PyJWT 2.13.0 introduced a guard i...

PYSEC-2026-4114 Oauthlib: Timing Attack Vulnerability in PKCE code_verifier Comparison (CWE-208)

Summary A timing side-channel vulnerability exists in the PKCE RFC 7636 implementation of the Authorization Code Grant flow. The codechallengemethodplain function uses Python's standard == operator for string comparison instead of a constant-time comparison function, potentially allowing...

PYSEC-2026-4152 PyJWT: Malformed RSA JWK aborts parsing of an entire JWK Set

Summary A malformed RSA JWK inside a JWK Set aborts parsing of the entire set instead of being skipped, because RSAAlgorithm.fromjwk can raise a plain ValueError that isn't caught by PyJWKSet's per-key error-skipping logic. Affected component / version - Package: PyJWT PyPI, ecosystem pip - Files...

PYSEC-2026-4151 PyJWT accepts public JWK containers as HMAC secrets

Summary PyJWT 2.13.0 contains an incomplete defense against algorithm confusion when an application mixes symmetric and asymmetric algorithms in one verification path. A public RSA, EC, or OKP JWK can be accepted as an HMAC secret when it is wrapped in a JWKS object, nested in an array, or...

PYSEC-2026-4140 PyJWT: PyJWKClient still amplifies unauthenticated JWKS fetches on unknown kid values (incomplete fix of CVE-2026-48524)

Summary CVE-2026-48524 GHSA-fhv5-28vv-h8m8, "PyJWKClient unbounded JWKS endpoint requests via attacker-controlled kid values DoS" was fixed in 2.13.0 by stopping fetchdata from clearing the cache on a fetch error. That closed one amplification path but did not add the mitigation the advisory's...

PYSEC-2026-4168 social-auth-core has a Session Fixation issue

Impact The partial-pipeline resume mechanism accepted partialtoken as a bearer credential without binding it to the browser session that created it. Applications using resumable partial pipeline steps could allow an attacker to start an authentication flow, obtain a valid partial token and...

PYSEC-2026-4165 social-auth-core: VK App backend accepts unsigned callback data when auth_key is missing

Impact The vk-app backend accepted VK application callback data without verifying the callback signature when the authkey parameter was omitted. Applications using this backend could treat unsigned attacker-controlled data as a verified VK identity. An attacker could choose callback fields such a...

PYSEC-2026-4030 Trestle is vulnerable to arbitrary file write via path traversal in author generate commands (Incomplete fix of CVE-2026-46345)

At a glance - Actor: attacker who controls the -o/--output argument to trestle author catalog,profile,ssp-generate e.g. via a CI pipeline that derives the output directory from repository-controlled data - Primitive: attacker-controlled --output value reaches trestleroot / args.output write sink...

PYSEC-2026-4034 Decepticon: Role-boundary forgery via ChatML special-token literals in web crawl output composed into LLM context

Summary Decepticon wraps web crawl results — the output of agent reconnaissance against target services — into LLM messages without neutralizing ChatML special-token literals. Under the BYOK Bring Your Own Key deployment model, users configure their own LLM credentials to any OpenAI-compatible...

PYSEC-2026-4053 hpack: Unbounded variable integer decoding can cause run-away computation on malformed input

Impact Users of the python-hyper/hpack library, most commonly used as downstream dependency of the python-hyper/h2 library an HTTP/2 client and server implementation. Unbounded variable integer decoding can cause run-away computation on malformed input leading to On^2 runtime, effectively blockin...

PYSEC-2026-4029 Trestle SSTI in Jinja2 include tags allows arbitrary code execution (Incomplete fix of CVE-2026-46439)

Reporter: Cavan Loughran, Celvex Group Inc. Summary ------- The fix for CVE-2026-46439 3.12.2 / 4.0.3 removed the recursive re-render loop in trestle/core/commands/author/jinja.py rendertemplate, but the custom include tags in trestle/core/jinja/tags.py MDSectionInclude, MDCleanInclude still...

PYSEC-2026-4169 social-auth-core has Login CSRF via Missing State Parameter in LoginRadius Backend

Impact The LoginRadius backend did not validate OAuth state during the authentication flow. Applications using this backend were vulnerable to login CSRF. An attacker could cause a victim's browser session to complete authentication using an attacker-controlled LoginRadius token, making the victi...

PYSEC-2026-4163 SCBE-AETHERMOORE Unauthenticated AetherBrowser Ops API Exposes Operator Email Digests

Summary The AetherBrowser API server scripts/aetherbrowser/apiserver.py exposes the POST /api/ops/check-email endpoint without any authentication. Any remote attacker can call this endpoint and trigger execution of the emailreader.py subprocess, which connects to configured ProtonMail or Gmail...

PYSEC-2026-4113 Oauthlib : Unsafe JSONP callback injection in RevocationEndpoint allows arbitrary JavaScript response generation

Summary When enablejsonp=True, oauthlib's RevocationEndpoint reflects the user-supplied callback parameter directly into JavaScript response bodies on both success and error paths without validating that it is a legal JSONP callback name. This allows arbitrary JavaScript response generation inste...

PYSEC-2026-4167 social-auth-core has an Improper Authentication issue

Impact The SAML backend accepted SAML responses on the Assertion Consumer Service endpoint without verifying that they matched a previously issued AuthnRequest. Applications using SAML account association could allow an attacker with a valid account on a trusted IdP to link the attacker's SAML...

PYSEC-2026-4166 social-auth-core Vulnerable to Account Takeover via Identity Binding Flaw in Vend Backend

Impact The Vend OAuth2 backend used only the numeric Vend userid as the social-auth UID. When multiple Vend shops authenticate through the same application, users from different shops with the same internal Vend user ID could collide in the social-auth association table. A user from one shop coul...

PYSEC-2026-4032 Decepticon: Role-boundary forgery via ChatML special-token literals in web crawl output composed into LLM context

Summary Decepticon wraps web crawl results — the output of agent reconnaissance against target services — into LLM messages without neutralizing ChatML special-token literals. Under the BYOK Bring Your Own Key deployment model, users configure their own LLM credentials to any OpenAI-compatible...

PYSEC-2026-4033 Decepticon: Role-boundary forgery via ChatML special-token literals in web crawl output composed into LLM context

Summary Decepticon wraps web crawl results — the output of agent reconnaissance against target services — into LLM messages without neutralizing ChatML special-token literals. Under the BYOK Bring Your Own Key deployment model, users configure their own LLM credentials to any OpenAI-compatible...

PYSEC-2026-4172 Streamlink: HTTPSession follows HTTP redirects into file:// URLs, reading local files

Summary HTTPSession mounts a FileAdapter for the file:// scheme and inherits redirect handling unchanged from requests.Session. requests does not check for scheme downgrades or cross-protocol transitions when it follows a redirect, so any https request Streamlink makes can be redirected by the...

PYSEC-2026-4181 Zapros has an Unbounded Content-Encoding decompression chain that allows denial of service

Impact Who is impacted: - Any application using Zapros to make HTTP requests to untrusted servers - Applications that follow redirects to attacker-controlled hosts Attack vector: - A malicious HTTP server returns a response with many chained content encodings. When the client attempts to decode, ...

PYSEC-2026-4182 Zapros: Streaming decoders ignored the requested chunk size, allowing a single compressed response chunk to allocate unbounded memory (decompression bomb)

Impact Denial of service via memory exhaustion. Affects all callers who streamed compressed responses relying on the chunk size — explicit iterbyteschunksize=... or the default — to bound memory. The decoder ignored that bound, so a chunk could be far larger than requested and a single compressed...

PYSEC-2026-4052 Home Assistant: XSS in Statistics Graph Card

Summary An authenticated party can add a malicious name to any statistics-capable entity, allowing for Cross-Site Scripting attacks against anyone who views a Statistics Graph card containing that entity, when they hover over any data point on the chart. Payload Payload triggering An alternative,...

PYSEC-2026-4137 plone.app.dexterity has a Denial of Service due to excessive title or description length

Impact When creating content with a very large title or description field, Plone can become unresponsive. Even if the content loads, it can be hard to edit or delete, because the UI is unwieldy. Patches The problem has been patched in plone.app.dexterity. On Plone 6.2, upgrade to...

PYSEC-2026-4105 Mesop: Unauthenticated ANSI Escape Sequence Injection in CSP Reporting Endpoint

Summary The /csp endpoint accepts unauthenticated JSON reports and logs user-controlled values directly to stdout using print without escaping control characters. A remote attacker can include ANSI/VT100 escape sequences in fields such as blocked-uri or document-uri. When the logs are viewed in a...

PYSEC-2026-4138 plone.app.portlets Vulnerable to Remote Code Execution via TALES Injection

Impact The Classic portlet plone.app.portlets.portlets.classic used its user-supplied template/macro fields to build a TALES path expression that was then evaluated by the TAL path helper. Because the value was interpreted as a full TALES expression, a user able to add or edit a Classic portlet...

PYSEC-2026-4051 Home Assistant: mDNS Server-Side Request Forgery

Summary Home Assistant Green is vulnerable to a Server-Side Request Forgery SSRF via the mDNS/Zeroconf IPP integration. An unauthenticated attacker on the local network can send a crafted mDNS response to trick Home Assistant into making HTTP requests to arbitrary hosts, including internal servic...

PYSEC-2026-4065 lightrag-hku: Stored Cross-Site Scripting (XSS) in the LightRAG WebUI chat/answer renderer via ingested content

Summary The LightRAG WebUI renders assistant/answer chat content as raw HTML — react-markdown is configured with rehypePlugins=rehypeRaw and skipHtml=false and no HTML sanitizer rehype-sanitize, element allow-list, or custom urlTransform. Because answer content is derived from user-ingested...

PYSEC-2026-4061 lightrag-hku: Plaintext Passwords Compared Without Constant-Time Function

Summary When plaintext passwords are stored in AUTHACCOUNTS, the comparison uses Python's == operator which is not constant-time. An attacker with low-latency access can exploit timing differences to recover the password character by character. Details python lightrag/api/passwords.py:13-26 def...

PYSEC-2026-4064 lightrag-hku: SSRF via IPv6-transition address bypass (NAT64, IPv4-compatible, 6to4) of the native-markdown image-download guard

Summary LightRAG's native markdown parser downloads external images referenced by an uploaded markdown or textpack document. The only SSRF guard, validatedaddresses in lightrag/parser/markdown/parser.py, resolves the image host and rejects it when the resolved IP is not isglobal. That check is...

PYSEC-2026-4063 lightrag-hku: Sensitive Information Exposure Through Raw Exception Messages in API Error Responses

Summary The LightRAG API server passes raw Python exception messages directly into HTTP error responses across 30+ error handlers in every router. When combined with the default unauthenticated configuration see companion report on CWE-306, any network-reachable client can trigger exceptions whos...

PYSEC-2026-4111 Nautobot: Authorization bypass in approval workflow REST API allows self-approval and unauthorized activation of scheduled jobs

Impact This is an authorization bypass that escalates into unauthorized server-side job execution. 1. Primary impact - self-approval: The approver checks approver-group membership, change permission on the object under review, one-response-per-user are enforced only in the approve/deny actions on...

PYSEC-2026-4062 lightrag-hku: No Rate Limiting on /login Endpoint Allows Brute-Force Attacks

Summary The POST /login endpoint has no rate limiting, account lockout, or delay on failed attempts. An attacker can submit unlimited password guesses at full network speed. Details python lightrag/api/lightragserver.py:2161 @app.post"/login" async def loginformdata: OAuth2PasswordRequestForm =...

PYSEC-2026-4027 Autobahn Python permessage-deflate bypasses maxMessagePayloadSize after inflation

Summary Autobahn Python enforces maxMessagePayloadSize against the compressed WebSocket frame length before permessage-deflate inflation, then delivers the inflated message to application callbacks without a second size check. A client frame that is only 22 compressed bytes can inflate to 4096...

PYSEC-2026-4084 mcp-atlassian has an incomplete SSRF remediation

Summary The UserTokenMiddleware extracts URLs from X-Atlassian-Jira-Url and X-Atlassian-Confluence-Url HTTP headers and passes them directly to API client constructors without any SSRF validation. Affected Package - Ecosystem: PyPI - Package: mcp-atlassian - Affected versions: all versions before...

PYSEC-2026-4092 MCP Atlassian: Arbitrary server-local file upload to Jira/Confluence attachments via unrestricted file_path parameters

Summary The Jira and Confluence attachment upload tools accept caller-controlled file path parameters and read those paths from the MCP server's local filesystem before uploading the file as an Atlassian attachment. In local stdio deployments, this can expose files readable by the user's MCP...

PYSEC-2026-4110 Nautobot: Stored cross-site scripting (XSS) in object create/edit form help text

Impact What kind of vulnerability is it? Who is impacted? It has two related instances that share the same root cause: a user-controlled model field is assigned verbatim to a form field's helptext, which is rendered with Django's |safe filter renderfield.html, bypassing auto-escaping. In both cas...

PYSEC-2026-4088 MCP Atlassian: Arbitrary file read/exfiltration via upload_attachment missing validate_safe_path()

Summary The uploadattachment method in confluence/attachments.py reads and uploads arbitrary local files to Confluence without calling validatesafepath. Both download methods downloadattachment at line 223, downloadcontentattachments at line 272 correctly call validatesafepath before writing file...

PYSEC-2026-4100 MCP Atlassian: Incomplete fix for GHSA-7r34-79r5-rcc9: redirect-based SSRF via unhooked requests session in Jira user-permission lookup

Summary The fix for the SSRF vulnerability tracked as GHSA-7r34-79r5-rcc9 / CVE-2026-27826 is incomplete. That fix added two defenses: validateurlforssrf on the per-request X-Atlassian-Jira-Url / X-Atlassian-Confluence-Url headers blocking a directly-internal base URL, and a redirect-validation...

PYSEC-2026-4031 Autobahn Python permessage-deflate bypasses maxMessagePayloadSize after inflation

Summary Autobahn Python enforces maxMessagePayloadSize against the compressed WebSocket frame length before permessage-deflate inflation, then delivers the inflated message to application callbacks without a second size check. A client frame that is only 22 compressed bytes can inflate to 4096...

PYSEC-2026-4094 MCP Atlassian: OAuth fallback token storage writes plaintext access and refresh tokens with group-readable permissions

Summary When OAuth tokens are saved, MCP Atlassian always writes a plaintext fallback copy under /.mcp-atlassian/oauth-.json. The fallback file is created with the process default umask rather than restrictive permissions. In this environment the file was created as mode 0664, exposing access and...

PYSEC-2026-4096 MCP Atlassian: SSRF Protection Bypass

Environment - Project: sooperset/mcp-atlassian - Affected function: validateurlforssrf - Affected path: header-based Jira/Confluence URL authentication flow - Tested endpoint: POST /mcp - Tested version: 2.14.5 Description The SSRF protection in validateurlforssrf can be bypassed with a URL...

PYSEC-2026-4087 MCP Atlassian: Incomplete path traversal fix allows intra-CWD module overwrite and RCE (bypass of GHSA-xjgw-4wvw-rgm4)

Summary The path traversal fix introduced in v0.17.0 GHSA-xjgw-4wvw-rgm4 is incomplete. validatesafepath is called without an explicit basedir, defaulting to os.getcwd. In standard container deployments the process CWD is the application directory e.g. /app, so paths within that directory,...

PYSEC-2026-4103 [mcp-atlassian] Authentication bypass in HTTP transport: AtlassianOpaqueTokenVerifier accepts any non-empty token

Description mcp-atlassian deploys in two common patterns: Pattern A single-user, server-side credentials: operator sets JIRAUSERNAME + JIRAAPITOKEN or CONFLUENCEUSERNAME + CONFLUENCEAPITOKEN in environment variables. Server uses these to call Jira/Confluence. This is the documented quickstart...