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🛡️ JLSEC-2026-1138 — appbundler (CVE-2026-42766)

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Issue summary: A specially crafted password-encrypted CMS message can trigger a NULL pointer...

Issue summary: A specially crafted password-encrypted CMS message

can trigger a NULL pointer dereference during CMS decryption.

Impact summary: This NULL pointer dereference leads to an application crash

and a Denial of Service.

The CMS PasswordRecipientInfo.keyDerivationAlgorithm field is defined as

OPTIONAL in the ASN.1 specification and may therefore be absent in specially

crafted inputs. During the password-based CMS decryption the OpenSSL

CMS implementation dereferences this field without first checking whether it

was present.

An attacker who supplies such a CMS message to an application performing

password-based CMS decryption can trigger an application crash, leading to

a Denial of Service.

Applications that process password-encrypted CMS messages may be affected.

The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this

issue, as the affected code is outside the OpenSSL FIPS module boundary.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

JLSEC-2026-1138 is recorded against 3 packages.

  • appbundler
  • openresty-jll
  • openssl-jll

Timeline and source

Published on 3 August 2026 and last revised on 13 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
nvd.nist.gov (Web)
openssl-library.org (Web)

Other advisories for this package

appbundler has other advisories on record. If you are patching this one, these are worth checking on the same host:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-08-03
Updated 2026-08-20
Modified 2026-08-13
Fix URL N/A

Affected Packages

Software From version Fixed in
appbundler — —
openresty-jll — —
openssl-jll — —

References

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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