CVE-2023-51258: A memory leak issue discovered in YASM v.1.3.0 allows a local attacker to cause a denial of service via the ne

Routine

MEDIUM 5.5DOWNGRADE

CVE-2023-51258 is a medium-severity flaw (CVSS 5.5) affecting yasm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A memory leak issue discovered in YASM v.1.3.0 allows a local attacker to cause a denial of service via the new_Token function in the modules/preprocs/nasm/nasm-pp:1512.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 82%)
CISA exploited list	No
Weakness	CWE-401
Published	2024-01-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: tortall

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-01-18 21:15 UTCPublished CVE record published
2026-06-17 06:40 UTCUpdated Record last modified

tortall yasm DOWNGRADE

Affected: 1.3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3.0

1. Check installed version

apt-cache policy yasm || rpm -q yasm || yasm --version

2. No fixed release: DOWNGRADE to a release before 1.3.0 (Debian / Ubuntu)

apt-cache madison yasm sudo apt install yasm=<VERSION_BEFORE_1.3.0> sudo apt-mark hold yasm

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list yasm sudo dnf downgrade yasm-<VERSION_BEFORE_1.3.0> sudo dnf versionlock add yasm

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-51258?

yasm: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-51258 being exploited?

CVE-2023-51258 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-51258 affect?

CVE-2023-51258 affects yasm. Severity is medium (CVSS 5.5). A memory leak issue discovered in YASM v.1.3.0 allows a local attacker to cause a denial of service via the new_Token function in the modules/preprocs/nasm/nasm-pp:1512.

How urgent is CVE-2023-51258?

Priority 29/100. Public exploit reference

Related CVEs

CVE-2024-22653 MEDIUM 4.8 DOWNGRADE yasm commit 9defefae was discovered to contain a NULL pointer dereference via the yasm_section_bcs_append func
CVE-2023-49558 MEDIUM 5.5 DOWNGRADE An issue in YASM 1.3.0.86.g9def allows a remote attacker to cause a denial of service via the expand_mmac_para
CVE-2023-49557 MEDIUM 5.5 DOWNGRADE An issue in YASM 1.3.0.86.g9def allows a remote attacker to cause a denial of service via the yasm_section_bcs
CVE-2023-49556 MEDIUM 5.5 DOWNGRADE Buffer Overflow vulnerability in YASM 1.3.0.86.g9def allows a remote attacker to cause a denial of service via
CVE-2023-49555 MEDIUM 5.5 DOWNGRADE An issue in YASM 1.3.0.86.g9def allows a remote attacker to cause a denial of service via the expand_smacro fu

References

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