PYSEC-2026-2781 Open Babel has heap buffer overflow in SMILES OBSmilesParser::ParseSmiles

Summary A memory-safety vulnerability in Open Babel's SMILES parser caused a heap buffer overflow when reading a crafted input string. Details The flaw was in OBSmilesParser::ParseSmiles. A malformed SMILES input caused the parser to write past the end of a heap-allocated buffer. Impact Open Babe...

Open Babel has heap buffer overflow in ChemKin ChemKinFormat::CheckSpecies

SummaryA memory-safety vulnerability in Open Babel's ChemKin parser causeda heap buffer overflow when reading a crafted input file. DetailsThe flaw was in ChemKinFormat::CheckSpecies. A malformed speciesrecord caused the parser to write past the end of a heap-allocatedbuffer. ImpactOpen Babel is ...

Open Babel has NULL pointer dereference in MOL2 OBAtom::SetFormalCharge

SummaryA memory-safety vulnerability in Open Babel's MOL2 file format parsercaused a NULL pointer dereference when reading a crafted input file. DetailsThe flaw was in OBAtom::SetFormalCharge as called from the MOL2parser. A malformed atom record caused the parser to call the methodon a NULL atom...

Open Babel has NULL pointer dereference in CACAO CacaoFormat::SetHilderbrandt

SummaryA memory-safety vulnerability in Open Babel's CACAO parser caused aNULL pointer dereference when reading a crafted input file. DetailsThe flaw was in CacaoFormat::SetHilderbrandt. A malformed inputcaused the parser to dereference a NULL pointer while applying theHilderbrandt transformation...

Open Babel has an out-of-bounds read in CIF transform3d::DescribeAsString

Summary A memory-safety vulnerability in Open Babel's CIF file format parser allowed an out-of-bounds read when reading a crafted input file. Details The flaw was in OpenBabel::transform3d::DescribeAsString. A malformed symmetry-operation string caused the parser to read past the end of its...

PYSEC-2026-2785 Open Babel has out-of-bounds read in PQS lowerit (pre-buffer read)

Summary A memory-safety vulnerability in Open Babel's PQS parser caused an out-of-bounds pre-buffer read when reading a crafted input file. Details The flaw was in the lowerit helper used by the PQS parser. A malformed input caused the helper to read one or more bytes before the start of its inpu...

PYSEC-2026-2782 Open Babel has NULL pointer dereference in ChemKinFormat::ReadReactionQualifierLines

Summary A memory-safety vulnerability in Open Babel's ChemKin parser caused a NULL pointer dereference when reading a crafted input file. Details The flaw was in ChemKinFormat::ReadReactionQualifierLines. A malformed reaction qualifier record caused the parser to dereference a NULL pointer. Impac...

PYSEC-2026-2776 Open Babel has out-of-bounds write (overlapping memcpy) in zipstream basic_unzip_streambuf::underflow

Summary A memory-safety vulnerability in Open Babel's bundled zipstream decompression code caused an out-of-bounds write via overlapping memcpy when reading a crafted gzip-compressed chemistry file. Details The flaw was in basicunzipstreambuf::underflow. The decompression buffer refill path invok...

Open Babel has out-of-bounds read in PQS lowerit (pre-buffer read)

SummaryA memory-safety vulnerability in Open Babel's PQS parser caused anout-of-bounds pre-buffer read when reading a crafted input file. DetailsThe flaw was in the lowerit helper used by the PQS parser. Amalformed input caused the helper to read one or more bytes beforethe start of its input...

PYSEC-2026-2793 Open Babel has out-of-bounds write in Gaussian coords_type orientation parser

Summary A memory-safety vulnerability in Open Babel's Gaussian output parser allowed an out-of-bounds write when reading a crafted input file. Details The flaw was in the coordstype orientation parser inside the Gaussian output reader. A malformed orientation block caused the parser to write past...

PYSEC-2026-2772 Open Babel has NULL pointer dereference in CACAO CacaoFormat::SetHilderbrandt

Summary A memory-safety vulnerability in Open Babel's CACAO parser caused a NULL pointer dereference when reading a crafted input file. Details The flaw was in CacaoFormat::SetHilderbrandt. A malformed input caused the parser to dereference a NULL pointer while applying the Hilderbrandt...

Open WebUI: Stored XSS in Mermaid Markdown Preview

SummaryOpen WebUI renders Mermaid blocks from Markdown files in the file preview panel and inserts the generated SVG into the DOM using innerHTML.Because Mermaid is configured with securityLevel: 'loose', attacker-controlled Mermaid content can be rendered unsafely in this flow. A working payload...

PYSEC-2026-2736 Open WebUI: Sibling-Prefix Path Traversal via /cache/{path}

Summary A path traversal vulnerability exists in open-webui's cache file serving endpoint that allows any authenticated user to read files from sibling directories outside the intended cache directory, by exploiting an incomplete startswith containment check that lacks a trailing path separator...

Open WebUI BOLA: `search_knowledge_files` Allows Unauthorized Knowledge Base File Enumeration

SummaryOpen WebUI has a Broken Object Level Authorization BOLA vulnerability in the builtin searchknowledgefiles tool.When native function calling is enabled and the selected model has no attached knowledge bases, an authenticated user can call searchknowledgefiles with an arbitrary knowledgeid...

Open WebUI: Redirect-Bypass SSRF in OAuth `_process_picture_url` (incomplete-fix sibling of CVE-2026-45401)

Summarybackend/openwebui/utils/oauth.py::processpictureurl v0.9.5, lines 1435-1470 calls validateurlpictureurl on the initial URL only, then invokes aiohttp.ClientSession.getpictureurl, ... without allowredirects=False. aiohttp's default is allowredirects=True, maxredirects=10; the function does...

PYSEC-2026-2743 Open WebUI: SSRF Protection Bypass in Playwright Web Loader via HTTP Redirects

Summary The SafePlaywrightURLLoader implements a validateurl function to prevent SSRF attacks by checking the IP address of the user-provided URL. However, this validation is performed only on the initial URL. Since Playwright automatically follows HTTP redirects 301/302 by default, an attacker c...

Open WebUI: Cross-origin postMessage confirmation bypass via action:submit

SummaryThe chat message listener allows non-same-origin input:prompt and action:submit messages, so an external site can set prompt text and trigger submitPrompt in an authenticated victim session. I validated this with a cross-origin attacker page that auto-posted messages and caused unauthorize...

Open WebUI: SSRF Protection Bypass in Playwright Web Loader via HTTP Redirects

SummaryThe SafePlaywrightURLLoader implements a validateurl function to prevent SSRF attacks by checking the IP address of the user-provided URL. However, this validation is performed only on the initial URL.Since Playwright automatically follows HTTP redirects 301/302 by default, an attacker can...

Open WebUI: Stored XSS to Account Takeover via Model Profile Images

Stored XSS to Account Takeover via Model Profile Images in Open WebUIAffected: Open WebUI = 0.9.5Bypass of: GHSA-3wgj-c2hg-vm6q, GHSA-3856-3vxq-m6fc--- TL;DROpen WebUI patched SVG XSS in user profile images and webhook profile images but forgot to apply the same fix to model profile images. The...

Open WebUI: Forged chat-file link allows cross-user file read and deletion

SummaryOpen WebUI v0.9.5 lets an authenticated user attach arbitrary fileid values to their own chat message without checking whether they own or can read those files. If the attacker then shares that chat and grants themselves read access, hasaccesstofile treats the victim file as accessible...