Arbitrary `/tmp` read in discourse via `convert_heif!` decoder-confusion (regression of 4bf3bf6786)

🔹 Severity: Medium
🔹 Weakness: Information Disclosure
🔹 Reported To: Discourse
🔹 Reported By: fizzi
🔹 State: 🟢 Resolved
🔹 Disclosed: October 26, 2026, 3:43am (UTC)
🐞 Source: HackerOne

A decoder confusion vulnerability was discovered in image conversion functionality that allowed arbitrary file reads from temporary directories. When HEIF/HEIC files were processed, the conversion function failed to enforce a specific decoder prefix, allowing ImageMagick to dispatch based on file magic bytes instead of extension. Files with PostScript headers were routed through Ghostscript, which executed…

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CVE-2026-111483: GnuTLS accepts non-successful OCSP staples

🔹 Severity: Medium
🔹 Weakness: Improper Check for Certificate Revocation
🔹 Reported To: curl
🔹 Reported By: matty69v
🔹 State: 🟢 Resolved
🔹 Disclosed: October 26, 2026, 7:21am (UTC)
🐞 Source: HackerOne

A vulnerability was identified in curl version 8.22.0 and 8.23.0 when built with GnuTLS. The --cert-status option failed to properly validate stapled OCSP responses. Instead of checking the response status and certificate status within the response, the code only verified that some stapled OCSP response was received. This allowed a revoked certificate to be accepted if accompanied by a bogus or non-successful OCSP…

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CVE-2026-115528: wolfSSL TLS connect without cert

🔹 Severity: Medium
🔹 Weakness: Improper Certificate Validation
🔹 Reported To: curl
🔹 Reported By: matty69v
🔹 State: 🟢 Resolved
🔹 Disclosed: October 26, 2026, 7:21am (UTC)
🐞 Source: HackerOne

A vulnerability was discovered in curl when built with wolfSSL that allowed TLS connections to complete without certificate verification. When using default certificate verification settings, curl accepted anonymous Diffie-Hellman cipher suites that transmitted no server certificate. This caused user credentials and request data to be sent to unauthenticated servers. The issue was caused by insufficient certificate…

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CVE-2026-111951: curl -OJ truncate without filename

🔹 Severity: Low
🔹 Weakness: External Control of File Name or Path
🔹 Reported To: curl
🔹 Reported By: matty69v
🔹 State: 🟢 Resolved
🔹 Disclosed: October 26, 2026, 7:22am (UTC)
🐞 Source: HackerOne

In curl versions 8.23.0, 8.22.0, and master branch, a vulnerability was identified in the tool's handling of Content-Disposition headers with the -OJ flag. When a response contained multiple Content-Disposition headers where the first lacked a filename parameter, the tool would create and truncate an existing file to zero bytes before refusing to overwrite it, contradicting documented behavior. This occurred…

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CVE-2026-111878: OpenSSL provider UAF on TLS shutdown

🔹 Severity: Low
🔹 Weakness: Use After Free
🔹 Reported To: curl
🔹 Reported By: vansukmbg
🔹 State: 🟢 Resolved
🔹 Disclosed: October 26, 2026, 7:25am (UTC)
🐞 Source: HackerOne

A use-after-free vulnerability was identified in the OpenSSL provider implementation when using the multi interface. The vulnerability occurred when a private library context was freed while an SSL context that borrowed it remained queued for shutdown. This happened because the library context was stored only on the easy handle and was freed during cleanup before deferred shutdown operations completed. When…

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CVE-2026-111952: OpenSSL provider use-after-free again

🔹 Severity: Medium
🔹 Weakness: Use After Free
🔹 Reported To: curl
🔹 Reported By: moltenbit
🔹 State: 🟢 Resolved
🔹 Disclosed: October 26, 2026, 7:52am (UTC)
🐞 Source: HackerOne

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CVE-2026-111480: pause UAF from within callback

🔹 Severity: Low
🔹 Weakness: Use After Free
🔹 Reported To: curl
🔹 Reported By: rat5ak
🔹 State: 🟢 Resolved
🔹 Disclosed: October 26, 2026, 7:53am (UTC)
🐞 Source: HackerOne

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CVE-2026-111481: server-set cookie still aborts cookie jar

🔹 Severity: Low
🔹 Weakness: Improper Input Validation
🔹 Reported To: curl
🔹 Reported By: samueloph
🔹 State: 🟢 Resolved
🔹 Disclosed: October 26, 2026, 7:53am (UTC)
🐞 Source: HackerOne

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CVE-2026-111482: libssh2 knownhosts prefix match

🔹 Severity: Low
🔹 Weakness: Partial String Comparison
🔹 Reported To: curl
🔹 Reported By: samueloph
🔹 State: 🟢 Resolved
🔹 Disclosed: October 26, 2026, 7:53am (UTC)
🐞 Source: HackerOne

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CVE-2026-111484: OpenSSL with SecTrust accepts bad OCSP staples

🔹 Severity: Medium
🔹 Weakness: Improper Certificate Validation
🔹 Reported To: curl
🔹 Reported By: sujitjaunjal
🔹 State: 🟢 Resolved
🔹 Disclosed: October 26, 2026, 7:53am (UTC)
🐞 Source: HackerOne

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CVE-2026-111950: TLS session cache diff scheme reuse

🔹 Severity: Low
🔹 Weakness: Incorrect Comparison
🔹 Reported To: curl
🔹 Reported By: stze
🔹 State: 🟢 Resolved
🔹 Disclosed: October 26, 2026, 7:54am (UTC)
🐞 Source: HackerOne

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CVE-2026-111953: GnuTLS SecTrust OCSP staple bypass

🔹 Severity: Low
🔹 Weakness: Improper Certificate Validation
🔹 Reported To: curl
🔹 Reported By: sujitjaunjal
🔹 State: 🟢 Resolved
🔹 Disclosed: October 26, 2026, 7:54am (UTC)
🐞 Source: HackerOne

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CVE-2026-111954: upload reader failed redirect UAF

🔹 Severity: Low
🔹 Weakness: Use After Free
🔹 Reported To: curl
🔹 Reported By: 1rhino2
🔹 State: 🟢 Resolved
🔹 Disclosed: October 26, 2026, 7:54am (UTC)
🐞 Source: HackerOne

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CVE-2026-115529: Schannel TLS auto client session resumption

🔹 Severity: Low
🔹 Weakness: Improper Authentication - Generic
🔹 Reported To: curl
🔹 Reported By: johnnykao
🔹 State: 🟢 Resolved
🔹 Disclosed: October 26, 2026, 7:54am (UTC)
🐞 Source: HackerOne

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server filename with control characters printed to terminal (`-J`)

🔹 Severity: Low
🔹 Weakness: Improper Neutralization of Escape, Meta, or Control Sequences
🔹 Reported To: curl
🔹 Reported By: gubee
🔹 State: 🔴 N/A
🔹 Disclosed: October 26, 2026, 7:55am (UTC)
🐞 Source: HackerOne

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Derived cookie Path aborts cookie jar loading in curl 8.23.0

🔹 Severity: Low
🔹 Weakness: Improper Input Validation
🔹 Reported To: curl
🔹 Reported By: threalwinky
🔹 State: 🔴 N/A
🔹 Disclosed: October 26, 2026, 8:02am (UTC)
🐞 Source: HackerOne

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Windows SSPI connection-pool probe can reuse a connection under the wrong user

🔹 Severity: Medium
🔹 Weakness: Authentication Bypass by Spoofing
🔹 Reported To: curl
🔹 Reported By: mr4bugs
🔹 State: 🔴 N/A
🔹 Disclosed: October 26, 2026, 9:09am (UTC)
🐞 Source: HackerOne

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20: HTAB before `Secure` attribute silently drops the Secure cookie flag

🔹 Severity: No Rating
🔹 Reported To: curl
🔹 Reported By: giant_anteater
🔹 State: 🔵 Duplicate
🔹 Disclosed: October 26, 2026, 9:10am (UTC)
🐞 Source: HackerOne

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14: HSTS cache import silently drops a longer-lived child beneath an includeSubDomains parent

🔹 Severity: No Rating
🔹 Weakness: Cleartext Transmission of Sensitive Information
🔹 Reported To: curl
🔹 Reported By: giant_anteater
🔹 State: 🔵 Duplicate
🔹 Disclosed: October 26, 2026, 9:10am (UTC)
🐞 Source: HackerOne

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FTP authentication options leak to a cross-origin FTP redirect with unrestricted auth disabled

🔹 Severity: Low
🔹 Weakness: Insufficiently Protected Credentials
🔹 Reported To: curl
🔹 Reported By: galcan
🔹 State: 🔴 N/A
🔹 Disclosed: October 26, 2026, 9:10am (UTC)
🐞 Source: HackerOne

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OpenSSL provider OSSL_LIB_CTX used after free via the connection shutdown list (CVE-2026-80229 fix incomplete)

🔹 Severity: Low
🔹 Weakness: Use After Free
🔹 Reported To: curl
🔹 Reported By: sujitjaunjal
🔹 State: 🔵 Duplicate
🔹 Disclosed: October 26, 2026, 9:10am (UTC)
🐞 Source: HackerOne

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