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CVE-2026-80179

Jwcrypto: jwcrypto: denial of service via malformed jwe tokens

5.9 Medium

A flaw was found in jwcrypto. A remote attacker can send a specially crafted JSON Web Encryption (JWE) token containing numerous period delimiters. This malformed token can force the JWE.deserialize() function to allocate excessive memory, leading to a MemoryError. This issue results in a denial of service (DoS) for services that process untrusted JWE values.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.30%Unchanged since Aug 28, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.9

Jwcrypto: jwcrypto: denial of service via malformed jwe tokens

A flaw was found in jwcrypto. A remote attacker can send a specially crafted JSON Web Encryption (JWE) token containing numerous period delimiters. This malformed token can force the JWE.deserialize() function to allocate excessive memory, leading to a MemoryError. This issue results in a denial of service (DoS) for services that process untrusted JWE values.

Record
CVE-2026-80179
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-770
Updated
2026-11-06
EUVDEUVD-2026-67278 5.9

A flaw was found in jwcrypto. A remote attacker can send a specially crafted JSON Web Encryption (JWE) token containing numerous period delimiters. This malformed token can force the JWE.deserialize() function to allocate excessive memory, leading to a MemoryError. This issue results in a denial of service (DoS) for services that process untrusted JWE values.

Record
EUVD-2026-67278
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-06
NVD 5.9

A flaw was found in jwcrypto. A remote attacker can send a specially crafted JSON Web Encryption (JWE) token containing numerous period delimiters. This malformed token can force the JWE.deserialize() function to allocate excessive memory, leading to a MemoryError. This issue results in a denial of service (DoS) for services that process untrusted JWE values.

Record
CVE-2026-80179
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-770
Updated
2026-11-06
OSVDEBIAN-CVE-2026-80179 5.9

A flaw was found in jwcrypto. A remote attacker can send a specially crafted JSON Web Encryption (JWE) token containing numerous period delimiters. This malformed token can force the JWE.deserialize() function to allocate excessive memory, leading to a MemoryError. This issue results in a denial of service (DoS) for services that process untrusted JWE values.

Record
DEBIAN-CVE-2026-80179
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-80179 5.9

A flaw was found in jwcrypto. A remote attacker can send a specially crafted JSON Web Encryption (JWE) token containing numerous period delimiters. This malformed token can force the JWE.deserialize() function to allocate excessive memory, leading to a MemoryError. This issue results in a denial of service (DoS) for services that process untrusted JWE values.

Record
UBUNTU-CVE-2026-80179
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVAZL-98337 No score

CVE-2026-80179 affecting package python-jwcrypto 0.6.0-9

A flaw was found in jwcrypto. A remote attacker can send a specially crafted JSON Web Encryption (JWE) token containing numerous period delimiters. This malformed token can force the JWE.deserialize() function to allocate excessive memory, leading to a MemoryError. This issue results in a denial of service (DoS) for services that process untrusted JWE values.

Record
AZL-98337
Updated
2026-11-05
Show 4 moreShow less
OSVopenSUSE-SU-2026:11712-1 No score

python313-jwcrypto-1.6.0-1.1 on GA media

These are all security issues fixed in the python313-jwcrypto-1.6.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:11712-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:21827-1 No score

Security update for python-jwcrypto

This update for python-jwcrypto fixes the following issues:

  • CVE-2026-80179: denial of service via malformed JWE tokens (bsc#1277639).
  • CVE-2026-84185: general JSON JWS kid binding bypass during JWKSet verification (bsc#1278707).
Record
openSUSE-SU-2026:21827-1
Updated
2026-11-02
OSVSUSE-SU-2026:23702-1 No score

Security update for python-jwcrypto

This update for python-jwcrypto fixes the following issues:

  • CVE-2026-80179: denial of service via malformed JWE tokens (bsc#1277639).
  • CVE-2026-84185: general JSON JWS kid binding bypass during JWKSet verification (bsc#1278707).
Record
SUSE-SU-2026:23702-1
Updated
2026-11-02
OSVSUSE-SU-2026:23722-1 No score

Security update for python-jwcrypto

This update for python-jwcrypto fixes the following issues:

  • CVE-2026-80179: denial of service via malformed JWE tokens (bsc#1277639).
  • CVE-2026-84185: general JSON JWS kid binding bypass during JWKSet verification (bsc#1278707).
Record
SUSE-SU-2026:23722-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
python-jwcrypto
Azure Linux:3
 through 0.6.0-9 None known
python-jwcrypto
Debian:12
 All versions, plus listed versions
1.1.0-11.1.0-1+deb12u11.5.4-11.5.6-11.5.6-1.11.5.6-1.1~deb13u11.5.6-1.2
 None known
python-jwcrypto
Debian:13
 All versions, plus listed versions
1.5.6-11.5.6-1.11.5.6-1.1~deb13u11.5.6-1.2
 None known
python-jwcrypto
Debian:14
 All versions, plus listed versions
1.5.6-11.5.6-1.11.5.6-1.1~deb13u11.5.6-1.2
 None known
python-jwcrypto
SUSE:Linux Enterprise Server 16.0
From an advisory covering 2 CVEs
 before 1.5.6-160000.4.1
1.5.6-160000.4.1
python-jwcrypto
SUSE:Linux Enterprise Server for SAP applications 16.0
From an advisory covering 2 CVEs
 before 1.5.6-160000.4.1
1.5.6-160000.4.1
python-jwcrypto
Ubuntu:16.04:LTS
 All versions, plus listed versions
0.2.1-1
 None known
python-jwcrypto
Ubuntu:18.04:LTS
 All versions, plus listed versions
0.3.2-10.4.2-1
 None known
python-jwcrypto
Ubuntu:20.04:LTS
 All versions, plus listed versions
0.6.0-10.6.0-2
 None known
python-jwcrypto
Ubuntu:22.04:LTS
 All versions, plus listed versions
0.8.0-11.0.0-2
 None known
Show 5 moreShow less
Affected packages
PackageAffectedFixed
python-jwcrypto
Ubuntu:24.04:LTS
 All versions, plus listed versions
1.1.0-11.5.4-1
 None known
python-jwcrypto
Ubuntu:26.10
 All versions, plus listed versions
1.5.6-11.5.6-1.11.5.6-1.2
 None known
python-jwcrypto
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.5.6-1
 None known
python-jwcrypto
openSUSE:Tumbleweed
From an advisory covering 3 CVEs
 before 1.6.0-1.1
1.6.0-1.1
python-jwcrypto
openSUSE:Leap 16.0
From an advisory covering 2 CVEs
 before 1.5.6-160000.4.1
1.5.6-160000.4.1

History

History
RecordedChangedSources
affected, factsCVE List, EUVD, NVD
factsOSV
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-80179 is a medium vulnerability (CVSS 5.9) in Red Hat Ansible Automation Platform 2, published August 27, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.30%, the 22nd percentile. No source names a fixed version.

References

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