Your message dated Tue, 25 Aug 2026 20:29:22 +0000
with message-id <[email protected]>
and subject line Bug#1143841: fixed in openssl 4.0.2-1
has caused the Debian Bug report #1143841,
regarding openssl: CVE-2026-54876
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
1143841: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1143841
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Source: openssl
Version: 3.6.3-1
Severity: important
Tags: security upstream
X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>
Hi,
The following vulnerability was published for openssl.
CVE-2026-54876[0]:
| Issue summary: A malicious TLS server can cause a memory leak in a
| TLS client that has enabled OCSP response checking by sending an
| OCSP response that contains no single response entries. Impact
| summary: An attacker can leak an attacker-tunable amount of memory
| per TLS handshake in a victim client application. A long-running
| client that repeatedly connects to a malicious server can have its
| memory exhausted, resulting in a Denial of Service. CWE: CWE-401:
| Missing Release of Memory after Effective Lifetime Description: The
| affected function is called during X.509 certificate chain
| verification when OCSP response checking is enabled with the
| X509_V_FLAG_OCSP_RESP_CHECK or X509_V_FLAG_OCSP_RESP_CHECK_ALL
| verification flags, for example when a TLS client verifies an OCSP
| response stapled into the TLS handshake by the server. When the
| received BasicOCSPResponse contains an empty SEQUENCE OF
| SingleResponse, which is permitted on the wire and accepted by the
| OpenSSL decoder, the OCSP_BASICRESP structure allocated by
| OCSP_response_get1_basic() was not freed because an early return
| bypassed the cleanup code at the end of the function. The amount of
| memory leaked per handshake can be amplified by the attacker by
| padding the certs field of the BasicOCSPResponse with bogus
| certificates, which are parsed and stored in the leaked structure
| before the empty response check triggers the early return. A long-
| running TLS client that repeatedly connects to a malicious server
| can have its memory exhausted over time. OCSP response checking is
| not enabled by default. Only client applications that explicitly
| enable the OCSP response check verification flags are affected.
| FIPS impact: no The FIPS modules in 4.0 and 3.6 are not affected by
| this issue as the affected code is outside the OpenSSL FIPS module
| boundary.
If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.
For further information see:
[0] https://security-tracker.debian.org/tracker/CVE-2026-54876
https://www.cve.org/CVERecord?id=CVE-2026-54876
[1] https://openssl-library.org/news/secadv/20260805.txt
Please adjust the affected versions in the BTS as needed.
Regards,
Salvatore
--- End Message ---
--- Begin Message ---
Source: openssl
Source-Version: 4.0.2-1
Done: Sebastian Andrzej Siewior <[email protected]>
We believe that the bug you reported is fixed in the latest version of
openssl, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Sebastian Andrzej Siewior <[email protected]> (supplier of updated
openssl package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
Format: 1.8
Date: Tue, 25 Aug 2026 21:19:42 +0200
Source: openssl
Architecture: source
Version: 4.0.2-1
Distribution: experimental
Urgency: medium
Maintainer: Debian OpenSSL Team <[email protected]>
Changed-By: Sebastian Andrzej Siewior <[email protected]>
Closes: 1143841 1144615 1145172
Changes:
openssl (4.0.2-1) experimental; urgency=medium
.
* Import 4.0.2
- CVE-2026-18798 ("QUIC Server May Trigger Double Free When Processing
INITIAL Packet")
- CVE-2026-63072 ("Heap Buffer Overflow in CMS Key Unwrapping")
- CVE-2026-63076 ("Invalid Pointer Dereference in CMP Server via Crafted
protectionAlg")
- CVE-2026-14457 ("RPK Server Signature Algorithm Selection Can Dereference
a Missing Certificate")
- CVE-2026-54874 ("Excessive Memory Use Buffering DTLS Records for a Future
Epoch")
- CVE-2026-63073 ("Untrusted Sender DN Used as Format String in CMP
Response
Validation")
- CVE-2026-63074 ("CMP Indefinite Cache Growth of ExtraCerts")
- CVE-2026-63075 ("QUIC ACK-only Packet Retention Can Cause Memory
Exhaustion")
- CVE-2026-75803 ("AEAD Forgeries with Empty Ciphertext When Using
EVP_Cipher()") (Closes: #1145172)
- CVE-2026-14456 ("Unbounded Memory Growth in QUIC Server Incoming Channel
Queue") (Closes: #1144615)
- CVE-2026-54876 ("Client-Side Memory Leak in OCSP Response Checking")
(Closes: #1143841)
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