VulnerabilityPublished 26 Oct 2026Updated 28 Oct 2026

CVE-2026-115906: Rust zip · From 0.6.0 until 9.0.0, the AES entry reader in src/aes.rs verifies its HMAC only when the

Affects rust-zipSource GCVE Database

Authoritative record:CVE-2026-115906· Medium 6.5

Not known to be exploited · CVSS 6.5 Medium · fixed in 9.0.0 : update rust-zip when convenient.

Data as of 28 Oct 2026, 22:31 UTC

CVSS 3.1 base score

6.5Medium

How severe the flaw is on the 0–10 CVSS scale.

Patch: Available – fixed in 9.0.0

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: None
Integrity: High
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 26 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Patches and advisories

security-tracker.debian.org/tracker/cve-2026-115906 (opens in a new tab)

Affected software

Product	Affected	Fixed in
Ubuntu 26.10rust-zip`pkg:deb/ubuntu/rust-zip?arch=source&distro=stonking`Other threats	Affected =5.1.1-3 =5.1.1+dfsg-1	Fixed in–
Ubuntu 26.04 LTSrust-zip`pkg:deb/ubuntu/rust-zip?arch=source&distro=resolute`Other threats	Affected =2.5.0-1 =5.1.1-2 =5.1.1-3	Fixed in–
Ubuntu 24.04 LTSrust-zip`pkg:deb/ubuntu/rust-zip?arch=source&distro=noble`Other threats	Affected =0.6.6-1 =0.6.6-2	Fixed in–
Ubuntu 22.04 LTSrust-zip`pkg:deb/ubuntu/rust-zip?arch=source&distro=jammy`Other threats	Affected =0.5.8-2 =0.5.13-1	Fixed in–
Ubuntu 20.04 LTSrust-zip`pkg:deb/ubuntu/rust-zip?arch=source&distro=focal`Other threats	Affected =0.5.0-1 =0.5.3-1 =0.5.3-2	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

zip is a zip library for Rust that supports reading and writing simple ZIP files. From 0.6.0 until 9.0.0, the AES entry reader in src/aes.rs verifies its HMAC only when the attacker-controlled data counter reaches zero. If the underlying bounded reader reaches the real end of the archive while data_remaining is still positive, or if an encrypted entry has no payload, the reader can return a clean end of stream without reading and comparing the authentication tag. Applications using by_index_decrypt, by_name_decrypt, by_path_decrypt, or password-enabled by_index_with_options can therefore accept modified plaintext without an authentication error. This issue is fixed in version 9.0.0.

References

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