USN-8916-2: PyJWT vulnerabilities

USN-8916-1 fixed vulnerabilities in PyJWT. This update provides the corresponding fix for PyJWT on Ubuntu 26.10. Original advisory details: YuSung Han discovered that PyJWT did not properly validate certain JWK keys when performing HMAC verification. An attacker could possibly use this issue to...

Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : PyJWT vulnerabilities (USN-8916-1)

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8916-1 advisory. YuSung Han discovered that PyJWT did not properly validate certain JWK keys when performing HMAC...

USN-8916-1 pyjwt vulnerabilities

YuSung Han discovered that PyJWT did not properly validate certain JWK keys when performing HMAC verification. An attacker could possibly use this issue to forge authentication tokens. This issue only affected Ubuntu 26.04 LTS. CVE-2026-102266 Rohan Das discovered that PyJWT incorrectly handled...

USN-8916-1: PyJWT vulnerabilities

YuSung Han discovered that PyJWT did not properly validate certain JWK keys when performing HMAC verification. An attacker could possibly use this issue to forge authentication tokens. This issue only affected Ubuntu 26.04 LTS. CVE-2026-102266 Rohan Das discovered that PyJWT incorrectly handled...

SUSE CVE-2026-90333

In the Linux kernel, the following vulnerability has been resolved: dm-integrity: replace forgeable discard filler with a keyed sector marker The discard-block check in dmintegrityrwtag treats a stored tag of all 0xf6 bytes DISCARDFILLER as proof a block was discarded and skips HMAC verification...

PT-2026-94681

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the dm-integrity component where the dm integrity rw tag function treats a stored tag consisting of all 0xf6 bytes DISCARD FILLER as evidence that a block was discarde...

CVE-2026-90333: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: dm-integrity: replace forgeable discard filler with a keyed sector marker The discard-block check in dmintegrityrwtag treats a stored tag of all 0xf6 bytes DISCARDFILLER as proof a block was discarded and skips HMAC verification...

CVE-2026-90333: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: dm-integrity: replace forgeable discard filler with a keyed sector marker The discard-block check in dmintegrityrwtag treats a stored tag of all 0xf6 bytes DISCARDFILLER as proof a block was discarded and skips HMAC verification...

CVE-2026-57122

PraisonAI is a multi-agent teams system. Prior to 4.6.59, the WhatsApp and Linear bot webhook handlers verify HMAC signatures only when WHATSAPPAPPSECRET or LINEARWEBHOOKSECRET is configured and otherwise parse and dispatch unsigned request bodies. A remote unauthenticated client that reaches the...

CVE-2026-57122

PraisonAI (a multi-agent LLM framework) is vulnerable to fail-open webhook signature verification in its WhatsApp and Linear bot adapters prior to 4.6.59 . When WHATSAPP_APP_SECRET or LINEAR_WEBHOOK_SECRET is unset—the default on a fresh install —the _handle_webhook handler skips HMAC-SHA256 veri...

CVE-2026-57122 PraisonAI: Webhook signature verification skipped (fail-open) when secret unset, allowing forged inbound webhooks (WhatsApp & Linear bots)

PraisonAI is a multi-agent teams system. Prior to 4.6.59, the WhatsApp and Linear bot webhook handlers verify HMAC signatures only when WHATSAPPAPPSECRET or LINEARWEBHOOKSECRET is configured and otherwise parse and dispatch unsigned request bodies. A remote unauthenticated client that reaches the...

ruby-jwt: ruby-jwt: Authentication bypass due to empty key in HMAC verification

A flaw was found in ruby-jwt, a Ruby implementation of the RFC 7519 OAuth JSON Web Token JWT standard. A remote attacker can exploit this vulnerability by crafting a malicious token that is accepted due to an empty key being used in the HMAC Hash-based Message Authentication Code digest calculati...

ruby-jwt: ruby-jwt: Authentication bypass due to empty key in HMAC verification

A flaw was found in ruby-jwt, a Ruby implementation of the RFC 7519 OAuth JSON Web Token JWT standard. A remote attacker can exploit this vulnerability by crafting a malicious token that is accepted due to an empty key being used in the HMAC Hash-based Message Authentication Code digest calculati...

ruby-jwt: ruby-jwt: Authentication bypass due to empty key in HMAC verification

A flaw was found in ruby-jwt, a Ruby implementation of the RFC 7519 OAuth JSON Web Token JWT standard. A remote attacker can exploit this vulnerability by crafting a malicious token that is accepted due to an empty key being used in the HMAC Hash-based Message Authentication Code digest calculati...

ruby-jwt: ruby-jwt: Authentication bypass due to empty key in HMAC verification

A flaw was found in ruby-jwt, a Ruby implementation of the RFC 7519 OAuth JSON Web Token JWT standard. A remote attacker can exploit this vulnerability by crafting a malicious token that is accepted due to an empty key being used in the HMAC Hash-based Message Authentication Code digest calculati...

Phalcon: Non-constant-time HMAC verification in `Encryption\Crypt::decrypt` (timing side-channel)

Summary Phalcon\Encryption\Crypt provides authenticated encryption: when useSigning is enabled the default, encrypt appends an HMAC tag and decrypt verifies it before returning the plaintext. The verification compares the attacker-supplied tag against the freshly computed HMAC using PHP/Zephir...

GHSA-8JQH-95G6-7JPJ Phalcon: Non-constant-time HMAC verification in `Encryption\Crypt::decrypt` (timing side-channel)

Summary Phalcon\Encryption\Crypt provides authenticated encryption: when useSigning is enabled the default, encrypt appends an HMAC tag and decrypt verifies it before returning the plaintext. The verification compares the attacker-supplied tag against the freshly computed HMAC using PHP/Zephir...

CVE-2026-72861 Appwrite Templates github-issue-bot Skips Webhook Signature Verification When the X-Hub-Signature-256 Header Is Absent

The github-issue-bot templates in appwrite/templates verify the GitHub webhook signature with an inverted condition. verifyWebhook in node/github-issue-bot/src/github.js and in node-typescript/github-issue-bot/src/github.ts returns "typeof signature !== 'string' || await verify...", so when the...

Security update for perl-Mojo-JWT (moderate)

openSUSE Security Update: Security update for perl-Mojo-JWT Announcement ID: openSUSE-SU-2026:0279-1 Rating: moderate References: 1271935 Cross-References: CVE-2026-9537 Affected Products: openSUSE Backports SLE-15-SP7 An update that fixes one vulnerability is now available. Description: This...

EUVD-2026-53920

aiosend is a synchronous and asynchronous Crypto Pay API client. Pror to version 3.0.7, WebhookHandler.feedupdate deserializes the entire request body before verifying the HMAC signature. This allows an unauthenticated attacker to force expensive parsing of arbitrary JSON payloads that will...