Integer overflow in base64

published 2017-05-03 9y ago modified 2026-06-17 4mo ago also GHSA-x67x-vg9m-65c3 , RUSTSEC-2017-0004 , EUVD-2021-1929

cvss: 9.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.5%; EPSS 1.5% chance of exploitation in 30 days, percentile 75%
public exploits: 0; none known

rust-base64 version <= 0.5.1 is vulnerable to a buffer overflow when calculating the size of a buffer to use when encoding base64 using the 'encode_config_buf' and 'encode_config' functions

Patch / fix

fixed in 1 links 1

crates.io base64 0.5.2

github.com/alicemaz/rust-base64@24ead98 commit

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Exploit prediction

1.53% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.0	9.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub	3.0	9.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
OSV	3.0	9.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
crates.io	base64	<0.5.2 >=0.0.0-0, <0.5.2	0.5.2

Classification

Weakness

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

github.com /alicemaz/rust-base64/commit/24ead980daf11ba563e4fb2516187a56a71ad319
web
github.com /RustSec/advisory-db/blob/master/crates/base64/RUSTSEC-2017-0004.toml
third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2017-1000430
advisory
github.com /alicemaz/rust-base64
package
rustsec.org /advisories/RUSTSEC-2017-0004.html
web, advisory
crates.io /crates/base64
package

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.